Tilting oscillation generator



K. SCHLESINGER TILTING OSCILLATION GENERATOR Filed NOV. 18, 1932 Um mws'fw:

Aprr'ii 2&3, T1936.

Patented Apr. 28, 1936 UNITED STATES PATENT OFFIQE Application November 18, 1932, Serial No. 643,238 In Germany November 19, 1931 9 Claims. (c1. 25o-as) The subject matter of the present invention is constituted by a tilting oscillation generator which, in contradistinction to the arrangements hitherto known, possesses the advantage of simple adjustment of the position and the size of the image. The invention resides in the fact that there is rendered possible a practically separate adjustment of the position of the image on the one hand and the form or size of the image on the other hand.

Various forms of embodiment of the invention will be described more particularly in the following with reference to the accompanying drawing which shows in Figs. 1 and 2 two examples of a device according to the invention.

In Fig. 1, l is the charging tube, 2 the tilting condenser, 3 the tilting gaseous conduction lamp, t and. 5 a potentiometer system which with regard to the tilting oscillation is kept on a constant reference potential through the medium of the condenser 6. According now to the invention, there is situated in parallel with the tilting condenser an additional potentiometer arrangement, which may consist, for example, of the resistance 1 and the condenser 8. The potentiometer tap leads to a terminal 9, while the potentiometer tap of the first-mentioned arrangement consisting of the resistances 4 and 5 leads to the terminal designated I0. To the terminals 9 and I!) there are connected the consuming apparatus, 1. e., in the majority of cases in practice one or more pairs of deflecting plates of one or more Braun tubes.

Whereas in the case of the arrangements hitherto known the terminals 9, with omission of the potentiometer arrangemnt l, 8, have been connected in direct fashion with the point of connection between the tilting condenser 2 and the charging tube I, so that an adjustment of the potentiometer tap of the arrangement 4, 5 permitted merely of variation in the D. C. mean value of the tilting oscillation, and not in the amplitude of the tilting oscillations, a regulation of the tilting oscillation amplitude is now also rendered possible by the potentiometer arrangement. The condenser 8 has the object of makthe D. C. conditions independent of the position of the potentiometer tap of the potentiometer resistance i, so that the D. C. mean value of the tilting potential, and accordingly the position of the curve on the screen of a Braun tube connected with one of its pairs of deflecting plates to the terminals 9, I0 is adjustable per se at the potentiometer resistance 4, 5, without the amplitude of the tilting potential undergoing any practical change. Vice versa, a variation of the potentiometer adjustment of the potentiometer resistance l permits of variation in the amplitude of the tilting oscillation without appreciable effect on the position of the curve on the screen.

In order that the circuit comprising the re sistance and the condenser 8 will not disturb the generation of the tilting potential, the same in accordance with the additional subject matter of the invention is dimensioned in a manner based on the following considerations:

In order to prevent variation in the size and form of the tilting oscillation upon variation in the loading resistance connected with the terminals 9 and Ill, the potentiometer resistance 1 15 must be small as against the loading resistance, while the condenser 8 requires to possess an impedance, which is small in respect of all tilting frequencies as compared with the potentiometer resistance 1, as otherwise the condenser 8 would 20 be practically in parallel with the condenser 2, and thus produce variation in the tilting frequency. It has, therefore, been found practical to make the time constants R0 of the branch comprising the resistance 'NR) and the condenser 3(C large as compared with the reciprocal value of all tilting oscillation periods occurring. In one case suitable values have been found to be in respect to the resistance HR) 0.510 ohms, and in respect to the condenser 30 8(0) 0.5 ,u F, corresponding with a time constant of 0.25 second, and accordingly corresponding with a smallest undisturbed tilting frequency of 4 periods. Upon the dimensioning of the resistance I care should be taken that the same 35 does not drop below a certain size, as otherwise in this manner the tilting curve would be distorted round about the ignition moment. The same must possess at least the value wherein E2 is the ignition potential and ii the charging current. The condition is then fulfilled that the condenser charging current always 45 remains sufiicient in face of the leakage current over the potentiometer resistance 1. The danger of a curve displacement is avoided if the dividing of the potential is performed not with the assistance of an ohmic resistance, but in a purely 50 capacitance sense.

An arrangement of this kind is illustrated in Fig. 2. In this figure the same elements as in Fig. l have been furnished with corresponding d signations. In place of the potential divider 55 branch comprising the potentiometer resistance 1 and condenser 8 there is provided the potential divider branch consisting of the condensers l1 and I8. In a possible form of embodiment the tilting condenser 2 is provided with a value of 10 F-Ql F, the condenser IS with a size of 1000 ,u/LF', and the condenser l'!, which is constituted by a variable capacity, with a size of 10-1000 LF. With a dimensioning of this kind a variation of the capacity Ii means merely a relatively weak detuning of the tilting frequency, and under no circumstances a displacement of the curve. The detuning is very small, as in television arrangements it is at no time necessary to employ tilting condensers smaller than approximately 0,01 ,uF, even in the case of the smallest charging currents of approximately 2 milliamperes. In consequence the tilting condenser is always sufficiently large as compared with the maximum value of the condenser ii. The arrangements according to the invention may be employed for all purposes in connection with which tilting condensers are required. The same adapt themselves admirably for the operation of Braun tubes, and more particularly television apparatus in which Braun tubes are employed. The stated values or sizes relate, for example, to tilting apparatus such as have proved to be useful in the television art.

I claim:

1. Means for producing tilting oscillations having a variable and a direct current component comprising a unidirectional source of potential, a condenser, means for charging said condenser from said source, means for discharging said condenser, independent means for adjusting said variable and said direct current component, said means for adjusting said variable current component comprising two impedance means in series connected across said condenser, one of said impedance means comprising a second condenser, said means for adjusting said direct current component comprising a potentiometer resistance connected across said source, and output connections, one being connected between said two impedances and the other being connected to a point on said potentiometer resistance.

2. Means for producing tilting oscillations having a variable and a direct current component comprising a unidirectional source of potential, a condenser, means for charging said condenser from said source, means for discharging said condenser, independent means for adjusting said variable and said direct current component, said means for adjusting said variable current component comprising two impedance means in series connected across said condenser, one of said impedance means comprising a second condenser, and the other one comprising an ohmic resistance, said means for adjusting said direct current component comprising a potentiometer resistance connected acrosssaid source, and output connections, one being connected between said two impedances and the other being connected to a point on said potentiometer resistance.

3. Means for producing tilting oscillations having a variable and a direct current component comprising a unidirectional source of potential, a condenser, means for charging said condenser from such source, means having an ignition potential for discharging said condenser, independent means for adjusting said variable and said direct current component, said means for adjusting said variable current component comprising two impedance means in series connected across said condenser, one of said impedance means comprising a second condenser, and the other one comprising an ohmic resistance being at least equal to the ratio of said ignition potential to the first condenser charging current, said means for adjusting said direct current component comprising a potentiometer resistance connected across said source, and output connections, one being connected between said two impedances and the other being connected to a point on said potentiometer resistance.

4. Means for producing tilting oscillations having a variable and a direct current component comprising a unidirectional source of potential, a condenser, means for charging said condenser from said source, means for discharging said condenser, independent means for adjusting said variable and said direct our ent component, said means for adjusting said variable current component comprising two impedance means in series connected across said condenser, one of said impedance means comprising a second condenser, and the other one comprising an ohmic resistance, said means for adjusting said direct current component comprising a potentiometer resistance connected across said source, and a third condenser and output connections, one being connected between said two impedances and the other being connected to a point on said potentiometer resistance, said third condenser being connected between said other output connection and said potentiometer resistance.

5. Means for producing tilting oscillations having a variable and a direct current component comprising a unidirectional source of potential, a condenser, means for charging said condenser from said source, means for discharging said condenser, independent means for adjusting said variable and said direct current component, said means for adjusting said variable current component comprising two impedance means in series connected across said condenser, said impedance means comprising two condensers, one of said condensers being adjustable, said means for adjusting said direct current component comprising a potentiometer resistance connected across said source, and output connections, one being connected between said two impedances and the other being connected to a point on said potentiometer resistance.

6. Means for producing tilting oscillations having a variable and a direct current component comprising a unidirectional source of potential, a condenser, means for charging said condenser from said source, means for discharging said condenser, independent means for adjusting said variable and said direct current component, said means for adjusting said variable current component comprising two impedance means in series connected across said condenser, one of said impedance means comprising a second condenser, and the other one comprising an adjustable ohmic resistance, said means for adjusting said direct current component comprising a potentiometer resistance connected across said source, and output connections, one being connected between said two impedances and the other being connected to a point on said potentiometer resistance, a load being connected across said two output connections, said adjustable ohmic resistance being small as compared with said load.

'7. Means for producing tilting oscillations having a variable and a direct current component comprising a unidirectional source of potential,

a condenser, means for charging said condenser from said source, means for discharging said condenser, independent means for adjusting said variable and said direct current component, said means for adjusting said variable current component comprising two impedance means in series connected across said condenser, one of said impedance means comprising a second condenser and the other one comprising an ohmic resistance, said means for adjusting said direct current component comprising a potentiometer resistance connected across said source, and output connections, one being connected between said two impedances and the other being connected to a point on said potentiometer resistance, the im pedance of said charging means being such that the first condenser charging current is large as compared to the current which passes through said ohmic resistor due to leakage of said second condenser.

8. Means for producing tilting oscillations having a variable and a direct current component comprising a unidirectional source of potential, a condenser, means for charging said condenser from said source, means for discharging said condenser, independent means for adjusting said variable and said direct current component, said means for adjusting said variable current component comprising two impedance means in series connected across said condenser, one of said impedance means comprising a second condenser, and the other one comprising an ohmic resistance, said means for adjusting said direct current component comprising a potentiometer resistance connected across said source, and output connections, one being connected between said two impedances and the other being connected to a point on said potentiometer resistance, the impedance of said second condenser being small in respect of all frequency components of said tilting oscillations as compared with the resistance of said ohmic resistance.

9. Means for producing tilting oscillations having a variable and a direct current component comprising a unidirectional source of potential, a condenser, means for charging said condenser from said source, means for discharging said condenser, independent means for adjusting said Variable and said direct current component, said. means for adjusting said variable current component comprising two impedance means in series connected across said condenser, one of said impedance means comprising a second condenser, and the other one comprising an ohmic resistance, said means for adjusting direct current component comprising a potentiometer resistance connected across said source, and output connections, one being connected between said two impedances and the other being connected to a point on said potentiometer resistance, the time constant of said ohmic resistance and said second condenser being large as compared with the reciprocal value of the occurring periods of said tilting oscillations.

KURT SCHLESINGER. 

